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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1367932

Title:
  qemu VM crashes the host

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My qemu host keeps crashing every once in a while and this seems to
  happen when there is some load and/or network traffic happening in the
  2 guests it powers.

  This time I was able to capture a crash trace:

  Sep 10 16:49:45 ocelot kernel: [204709.569951] general protection fault: 0000 [#1] SMP 
  Sep 10 16:49:45 ocelot kernel: [204709.570004] Modules linked in: vhost_net vhost macvtap macvlan bridge nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables xt_LOG xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_owner xt_conn
  track nf_conntrack iptable_filter ip_tables x_tables eeepc_wmi asus_wmi sparse_keymap video 8021q garp stp mrp llc radeon kvm_amd kvm ttm drm_kms_helper drm sp5100_tco serio_raw k10temp i2c_algo_bit i2c_piix4 wmi mac_hid configfs n
  ls_iso8859_1 hid_generic usbhid hid psmouse r8169 mii ahci libahci
  Sep 10 16:49:45 ocelot kernel: [204709.570337] CPU: 0 PID: 2944 Comm: qemu-system-x86 Not tainted 3.13.0-36-generic #63-Ubuntu
  Sep 10 16:49:45 ocelot kernel: [204709.570375] Hardware name: System manufacturer System Product Name/C60M1-I, BIOS 0305 08/07/2012
  Sep 10 16:49:45 ocelot kernel: [204709.570414] task: ffff8802120f1800 ti: ffff88020f428000 task.ti: ffff88020f428000
  Sep 10 16:49:45 ocelot kernel: [204709.570446] RIP: 0010:[<ffffffff81092ef8>]  [<ffffffff81092ef8>] preempt_notifier_unregister+0x18/0x40
  Sep 10 16:49:45 ocelot kernel: [204709.570497] RSP: 0018:ffff88020f429e00  EFLAGS: 00010206
  Sep 10 16:49:45 ocelot kernel: [204709.570523] RAX: 0020000000000000 RBX: ffff88020f430000 RCX: 0000000000000176
  Sep 10 16:49:45 ocelot kernel: [204709.572483] RDX: ffff8802120f1a18 RSI: 0000000081730c20 RDI: ffff88020f430008
  Sep 10 16:49:45 ocelot kernel: [204709.574491] RBP: ffff88020f429e00 R08: ffffffffa013e180 R09: 0000000000000000
  Sep 10 16:49:45 ocelot kernel: [204709.576508] R10: 00ffffffffffffff R11: 0000000000000000 R12: 0000000000000000
  Sep 10 16:49:45 ocelot kernel: [204709.578511] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
  Sep 10 16:49:45 ocelot kernel: [204709.580492] FS:  00007f77aefe2700(0000) GS:ffff88021ec00000(0000) knlGS:0000000000000000
  Sep 10 16:49:45 ocelot kernel: [204709.582461] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
  Sep 10 16:49:45 ocelot kernel: [204709.584402] CR2: 000009f39cad593d CR3: 00000002110b6000 CR4: 00000000000007f0
  Sep 10 16:49:45 ocelot kernel: [204709.586351] Stack:
  Sep 10 16:49:45 ocelot kernel: [204709.588261]  ffff88020f429e18 ffffffffa0141d8b ffff88020f430000 ffff88020f429ec0
  Sep 10 16:49:45 ocelot kernel: [204709.590194]  ffffffffa0141eae ffffffff810d8e51 000000010f429e78 00007f77bf54c000
  Sep 10 16:49:45 ocelot kernel: [204709.592119]  ffff880212f14a80 00000000000001c0 00007f77bf54c1c0 0000000000000081
  Sep 10 16:49:45 ocelot kernel: [204709.594027] Call Trace:
  Sep 10 16:49:45 ocelot kernel: [204709.595921]  [<ffffffffa0141d8b>] vcpu_put+0x1b/0x30 [kvm]
  Sep 10 16:49:45 ocelot kernel: [204709.597806]  [<ffffffffa0141eae>] kvm_vcpu_ioctl+0x10e/0x5b0 [kvm]
  Sep 10 16:49:45 ocelot kernel: [204709.599645]  [<ffffffff810d8e51>] ? futex_wake+0x1b1/0x1d0
  Sep 10 16:49:45 ocelot kernel: [204709.601449]  [<ffffffff81636f85>] ? sk_run_filter+0x295/0x700
  Sep 10 16:49:45 ocelot kernel: [204709.603222]  [<ffffffff811d0390>] do_vfs_ioctl+0x2e0/0x4c0
  Sep 10 16:49:45 ocelot kernel: [204709.604957]  [<ffffffff8110dfa3>] ? __secure_computing+0x73/0x260
  Sep 10 16:49:45 ocelot kernel: [204709.606676]  [<ffffffff811d05f1>] SyS_ioctl+0x81/0xa0
  Sep 10 16:49:45 ocelot kernel: [204709.608358]  [<ffffffff8172f1bf>] tracesys+0xe1/0xe6
  Sep 10 16:49:45 ocelot kernel: [204709.610003] Code: 05 18 02 00 00 48 89 47 08 5d c3 0f 1f 84 00 00 00 00 00 66 66 66 66 90 48 8b 07 48 8b 57 08 55 48 85 c0 48 89 e5 48 89 02 74 04 <48> 89 50 08 48 b8 00 01 10 00 00 00 ad de 48 89
   07 48 b8 00 02 
  Sep 10 16:49:45 ocelot kernel: [204709.613642] RIP  [<ffffffff81092ef8>] preempt_notifier_unregister+0x18/0x40
  Sep 10 16:49:45 ocelot kernel: [204709.615392]  RSP <ffff88020f429e00>
  Sep 10 16:49:45 ocelot kernel: [204709.622204] ---[ end trace 8804eab7229156e0 ]---

  
  CPU 0 is powering an OpenBSD 5.5 64 bit guests that is pinned to this CPU. At the time of the crash, the other guest (Trusty 64 bit) was running and pinned on CPU 1.


  $ lsb_release -rd
  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

  # Note: Even if I run a kernel from -proposed, the crashed happened before.
  $ apt-cache policy linux-image-3.13.0-36-generic qemu-system-x86 
  linux-image-3.13.0-36-generic:
    Installed: 3.13.0-36.63
    Candidate: 3.13.0-36.63
    Version table:
   *** 3.13.0-36.63 0
          500 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
          100 /var/lib/dpkg/status
  qemu-system-x86:
    Installed: 2.0.0+dfsg-2ubuntu1.3
    Candidate: 2.0.0+dfsg-2ubuntu1.3
    Version table:
   *** 2.0.0+dfsg-2ubuntu1.3 0
          500 http://archive.ubuntu.com/ubuntu/ trusty-updates/main amd64 Packages
          500 http://security.ubuntu.com/ubuntu/ trusty-security/main amd64 Packages
          500 http://archive.ubuntu.com/ubuntu/ trusty-proposed/main amd64 Packages
          100 /var/lib/dpkg/status
       2.0.0~rc1+dfsg-0ubuntu3 0
          500 http://archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-36-generic 3.13.0-36.63
  ProcVersionSignature: Ubuntu 3.13.0-36.63-generic 3.13.11.6
  Uname: Linux 3.13.0-36-generic x86_64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Sep 10 16:58 seq
   crw-rw---- 1 root audio 116, 33 Sep 10 16:58 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Wed Sep 10 17:11:33 2014
  HibernationDevice: RESUME=/dev/mapper/vgocelot-swap
  InstallationDate: Installed on 2014-07-30 (42 days ago)
  InstallationMedia: Ubuntu-Server 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.3)
  MachineType: System manufacturer System Product Name
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-36-generic root=/dev/mapper/vgocelot-root ro noswapaccount possible_cpus=2 nodelayacct debug ignore_loglevel
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-36-generic N/A
   linux-backports-modules-3.13.0-36-generic  N/A
   linux-firmware                             1.127.5
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/07/2012
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0305
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: C60M1-I
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0305:bd08/07/2012:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnC60M1-I:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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